Digital or Mechanical Tire Gauge?

OK here is a question that I haven't found an answer to. I always had a mechanical tire gauge and it seems to be working fine. Recently I bought a digital tire gauge. The digital gauge shows my tire is 4 to 6 pds more inflated than the mechanical one.. My OCD is kicking in and I need to know which one is accurate or close to it. Maybe y'all have had the same issue?